view libtomcrypt/notes/tech0005.txt @ 759:76fba0856749 ecc

More changes for KEX and ECDH. Set up hash descriptors, make ECC code work, ses.hash and ses.session_id are now buffers (doesn't compile)
author Matt Johnston <>
date Fri, 29 Mar 2013 00:28:09 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
line wrap: on
line source
Tech Note 0005
Minimizing Code Space
Tom St Denis



You can disable whole classes of algorithms on the command line with the LTC_NO_* defines.  From there you can manually turn on what you want to enable.  

The following build with GCC 3.4.4 on an AMD64 box gets you AES, CTR mode, SHA-256, HMAC, Yarrow, full RSA PKCS #1, PKCS #5 and ASN.1 DER in 
roughly 40KB of code (49KB on the ARMv4) (both excluding the math library).


Obviously this won't get you performance but if you need to pack a crypto lib in a device with limited means it's more than enough...

Neato eh?